方程是刻画现实世界有效的数学模型,一元二次方程是初中方程知识的进一步的拓展,是对以前所学代数知识的强化和巩固,为以后进一步学习二次函数,二次不等式打好坚实的基础。一、关于一元二次方程概念的教学一元二次方程的概念,其实学生很好理解,可以通过类比一元一次方程概念轻松得出。一元一次方程定义由三个要素构成:①只含一个未知数;②未知数的最高次数是1;③整式方程。一元二次方程只需要改一个字,就是把“1”改 The equation is an effective mathematical model for describing the real world. The univariate quadratic equation is a further extension of the knowledge of the junior high school equation. It reinforces and consolidates the algebraic knowledge previously learned, and further studies the quadratic function and the quadratic inequality in the future basis. First, the concept of a quadratic equation teaching The concept of a quadratic equation, in fact, students are well understood, can be easily derived through the concept of analogy one dollar equation. The definition of a unitary equation consists of three elements: ① contains only one unknown; ② the maximum number of unknowns is 1; ③ integral equation. A dollar quadratic equation only need to change a word, that is, “1 ” change